Enjoy it. I'm playing it right now and its amazing. The gameplay is really deep.

I think some of the poster here already gave you almost all the games suggestion but I highly recommend the Yakuza series.
You can start with Zero it's cheaper now with greatest hits then followed up with Kiwami 1 and 2 if you will enjoy Yakuza Zero.
Then by that time Y3-Y5 remaster should have been released already for the west then finish of with Yakuza 6.
As for my must have games.
Persona 5, BloodBorne, Uncharted 4, Ratchet and Clank, Shadow of the Colossus, Until Dawn, Monster Hunter World, Last of us, inFamous and Spiderman. 
I don't know if you like PS2 classic but go for Dark Cloud 1 and 2, Rogue Galaxy and Wild arms 3.

As for HZD, I just finish it this week and got the plat.
The GFX is awesome and sometimes I just stop and being mesmerize with the world.
The hunting aspect is fun. I spend most of my time hunting Robo Dinosaurs. I won't put into details but I hope in the sequel they will add more to hunt. They kinda missed a lot on this area. That will increase the replay aspect. 
The main story is unique and nice.
They also need to work on the side quest and the reward system for it. I enjoyed some of it but some are kinda repetitive and the rewards are meh.
Equipment customization is a bit simple. I like it somewhat but hopefully it will be more robust for the sequel and the skill set are also simple. It's like they didn't thought of it much.
I hate the climbing aspect of it they really need to work on that in the future. 
Anyway, it's 9/10 game for me.

bananaking21 said: S.Peelman said: It’s always nice to win things. I never won anything. You won my heart

Well that’s what I was after.

Horizon is one of the best looking games you will play this gen, truly breath taking. It has the best story in an open world game, Aloy is probably my favorite new character this gen. It is combat oriented, so no you won't get to do as much stuff as you did in games like Skyrim or BotW. It's more comparable to Witcher actually than the former two. The story, visuals and music will drive you forward its easily a 9/10 game on the first play through. Doesn't have the replay value of BotW or Skyrim but it's a hell of a worthy ride for 40-60 hours.

Uncharted 4 TLOU remastered GOW Bloodbourne etc